CN1357985A - Reverse outer-loop power controlling method for mobile communication system - Google Patents
Reverse outer-loop power controlling method for mobile communication system Download PDFInfo
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Abstract
The present invention relates to a reverse outer ring power control method in mobile communication system, it can maintain the present frame error rate at the target frame error rate by adjusting flexibly the information bit energy/interference band density (Eb/Io) according to the present frame error rate. (FER). To calculate out the differential value F(n) between the last frame error rate and target frame error rate of specific client and to use it as the first adjustment step parameter, to use the difference value delta F(n) of the differential value as the second adjustment step parameter, the present Eb/Io of the specific client will be adjusted by using the first and the second adjustment step parameter. The equation can be expressed as: Eb/Io (n+1)=Eb/Io(n)+F(n)KP+delta F(n) Kd, Kp, Kd are the positive parameter obtained from system simulation.
Description
The present invention relates to a kind of mobile communication technology, relate to a kind of backward power control method in the third generation (3G) code division multiple access (CDMA) mobile communication system or rather.
In code division multiple access (CDMA) mobile communication system, what adopted is unified channeling working method, and the repeatedly reflection of signal can cause serious multiple access to disturb (MAI).In addition, the user that all users use same frequency (carrier frequency), have a same frequency sends message to the base station in again may be at one time, because the attenuation characteristic of electromagnetic propagation, the closely user's that the base station receives signal is inevitable greater than the signal from the remote subscriber, therefore remote subscriber's signal is easy to be fallen by user's signal shielding closely, and this near-far interference can have a strong impact on the coverage of mobile communication system.Thereby multiple access disturbs and near-far interference is the technical problem that mobile communication system must overcome.
On the other hand, for the capacity that makes mobile communication system reaches maximum, ideal situation is to allow all users, no matter it is apart from the base station distance, the intensity of the signal of being launched after arriving the base station all about equally, power control mechanism is set up for realizing this effect.Usually the Poewr control method that adopts is based on the power control (abbreviation power control) of path loss and controls then more both combinations of use during actual the use based on the power of communication quality.
Again on the one hand, the CDMA2000 mobile communication system of current popular is by a standard among the 3G (Third Generation) Moblie standard I MT-2000 of International Telecommunication Association's proposition, can support IMT-2000 to require every business of carrying, different business has different service quality, and the shared bandwidth of these professional baseband signals also has nothing in common with each other.Yet the apread spectrum bandwidth of system is identical, and the method that adopts the two poles of the earth spread spectrum is in order to solve this contradiction, so that the spreading gain difference of different business.Under the condition of ideal power control, for business of the same type, the received power of base station should be identical; For dissimilar business, the power that the base station receives should be different.
Thereby power control is a key technology in the CDMA mobile communication systems, can comprise forward power control and reverse power control.Wherein, forward power control is used to reduce the interference to adjacent cell; Reverse power control then not only will overcome near-far interference, the more important thing is that the multiple access that is used to reduce between the user disturbs, to improve capability of communication system.Reverse power control comprises inner loop power control (abbreviation inner-loop power control) and exterior ring power control (abbreviation external circule power control) again.
Referring to Fig. 1, illustrate the inner-loop power control and the external circule power control of reverse power control in the CDMA2000 scheme among the figure, wherein 11 is travelling carriage (MS), the 12nd, base station (BTS), the 13rd, base station controller (BSC).In the CDMA2000 scheme, the power control section that the 20ms Frame is divided into 16 1.25ms, base station 12 is in the time period of 1.25ms, after carrying out valuation, can record the information bit ENERGY E b of this travelling carriage 11 and the ratio of disturbance spectrum density Io: Eb/Io (also can be expressed as Eb/No) from the signal strength signal intensity of arbitrary travelling carriage 11.
The process of its inner loop power control is: whether base station 12 is below or above certain standard of comparison (setting according to target frame error rate) according to this Eb/Io, determine that power control bit gets " 0 " or get " 1 ", as get " 0 " and need to represent travelling carriage to increase transmitting power, need travelling carriage to reduce transmitting power if get " 1 " expression; Adopt the insertion technology then, at forward link and then in the next 1.25ms power control section of these travelling carriage 11 time of arrival (toa), this power control bit is embedded in the forward traffic channel transmits, travelling carriage 11 does to increase or reduce the corresponding adjustment of transmitting power according to this power control bit " 0 " or " 1 ", the Eb/Io of base station actual reception can be maintained on the level of fixing, therefore, inner-loop power control occurs between travelling carriage 11 and the base station 12.
The process of its exterior ring power control is: base station controller (BSC) 13 is according to current communication quality, be the frame error rate (FER of the travelling carriage 11 that records of base station 12, usually the frame error rate with accumulative total is an index), export the change amount of Eb/Io again according to certain algorithm, desirable value to inner-loop power control Eb/Io is adjusted, with the frame error rate size that guarantees encoded speech frames that base station 12 is received or packet can Be Controlled within the specific limits, the representative value of this frame error rate can be made as and be lower than 3% as 1%.
Exterior ring power control is set, be for tackling the influence that the multidiameter fading channel environment brings various transmission conditions, as when travelling carriage 11 moves with friction speed, for its each frame error rate FER, just need corresponding Eb/Io desirable value, promptly under different mobile environment, keep certain Eb/Io and will cause different frame error rate FER, the purpose of exterior ring power control that Here it is.
Participate in exterior ring power control by base station controller (BSC) 13, according to current communication quality (by monitoring frame error rate FER), again according to certain method (algorithm), obtain the Eb/Io desirable value, with this reference standard as inner-loop power control, thereby the frame error rate FER that makes reverse link is towards target frame error rate FER
TargetClose, guarantee that the user's communications quality can maintain in the reasonable range.
Referring to Fig. 2, illustrate in the mobile communication system model of an emulation inner-loop power control of its reverse power control and external circule power control among the figure.Wherein 20 is mobile fading channels; The 21st, the encoder of travelling carriage (MS) side, the 22nd, the band spectrum modulation and the former of travelling carriage (MS) side, the 23rd, the transmitting power controller of travelling carriage (MS) side (TPC processing); The 24th, the RAKE receiver of base station (BTS) side, the 25th, the decoder of base station (BTS) side, the 26th, the Bit Error Code Statistics unit of base station (BTS) side, the 27th, signal/interference ratio (SIR) estimation unit of base station (BTS) side, the 28th, the external circule power control unit of base station (BTS) side.
After the information data process convolutional encoding (21) of travelling carriage (MS), carry out band spectrum modulation and shaping filter (22), then through mobile fading channel 20 transmission (adopt M.1225 model, translational speed is 40Km/h, and multi-user's interference M I simulates with white Gaussian noise); Information data after mobile fading channel 20 transmission is sent into RAKE receiver 24, the maximum of RAKE receiver 24 output merges ratio and sends into decoder 25 and decipher and send into the estimation that signal/interference ratio (SIR) estimation unit 27 carries out signal and the ratio of interference, decoder 25 output two parts data, part decoded data bits is sent Bit Error Code Statistics unit 26, by reference source data and decoded data bits, obtain the statistics of the error rate by Bit Error Code Statistics unit 26; The mistake frame designation data of another part is then sent into external circule power control unit 28, as the foundation of calculating Eb/Io, the Eb/Io that calculates then is the foundation of carrying out inner-loop power control, transmitting power controller (TPC processing) is compared the Eb/Io that calculates (the specific algorithm decision that standard of comparison is adopted by external circule power control unit 28) with a standard of comparison, obtain containing the TPC order of Eb/Io desirable value, mobile station side just can be ordered according to this TPC and be adjusted its transmitting power.
Dotted line represents that inner-loop power control points among the figure, and chain-dotted line represents that external circule power control points to.
At present, the method that obtains the Eb/Io desirable value in the exterior ring power control has had multiple, selects three kinds of methods wherein that it is described.
First method is: get different adjustment step values according to reception condition, when bad frame occurring continuously, then will get bigger by the adjustment step-length that the backstage is provided with; If frame error rate is above standard, but nearest several frames are all good, then adjust step-length and get smaller.If the frame error rate FER of actual reception is greater than desirable frame error rate, and the mistake of two continuous frames is arranged in the preceding n frame, step-length is adjusted into step1; If it is wrong that the frame error rate FER of actual reception greater than desirable frame error rate, is a nearest frame, then adjusting step-length is step2; If the frame error rate FER of actual reception is greater than desirable frame error rate, and the correct frame number that receives continuously surpasses Nf, and then adjusting step-length is step3; If the frame error rate FER of actual reception is less than desirable frame error rate, and the correct frame number that receives continuously surpasses Nf, and then adjusting step-length is step4; Other situation is next not to adjust.Wherein: step1＞step2＞step4＞step3.
Second method is: the full-rate vocoding that receives is sent into buffer memory in the buffer of a first in first out (FIFO) in the base station, and buffer storage length is 320 frames, counts the mistake frame number in the buffer memory then, can obtain the frame error rate of actual reception, and its computing formula is:
Bad frame number/buffer storage length in the frame error rate of actual reception (FER)=buffer memory, therefore, the target bad frame number under the target frame error rate is FER_Target * buffer storage length.
During actual the execution, after the base station whenever receives a frame, by a comparator frame error rate of reality and desirable frame error rate are compared, and proofread and correct the adjustment step-length with this, if actual frame error rate is during greater than desirable frame error rate then step-length subtracts 1, step-length remains unchanged if both equate, if actual frame error rate is during less than desirable frame error rate then step-length adds 1.Again the step-length of gained is sent into integrator,, revise the Eb/Io desirable value according to this calibration step through the total calibration step of integrator output behind 75 frames.
Second method is the scheme in patented technology of MOTOROLA.
The third method is: base station controller (BSC) whenever receives frame data, just Eb/Ib desirable value (desired value) is once upgraded, and algorithm is:
CRC?result＝NG：Eb/Io
REF(i+1)＝Eb/Io
REF(i)+E
INC
CRC?result＝OK：Eb/Io
REF(i+1)＝Eb/Io
REF(i)-E
DEC
Wherein, E
INC, E
DECWith target frame error rate PER (FER
Target) the pass be:
FER
Target×E
INC＝(1-FER
Target)×E
DEC
The third method is the method for advising in the 3GPP motion.
In the computational methods of above-mentioned three kinds of exterior ring powers control, substantially all be to judge whether frame error rate is greater than or less than target frame error rate earlier, allow the Eb/Io desirable value by a fixed step size adjustment more in view of the above, the result who does like this can cause the Eb/Io desirable value to surpass the desired Eb/Io value of target frame error rate, thus the waste that power is penetrated in environment-development in causing.In addition, in the computational methods of above-mentioned three kinds of exterior ring powers, for the determining and adjust determining of step-length of the adjustment of Eb/Io desirable value, adjustment amount, neither one model preferably all also.
The objective of the invention is to design the reverse outer-loop power control method in a kind of mobile communication system, when frame error rate is not equal to target frame error rate, can accurately adjust the desirable value of Eb/Io, reduce overtravel, and can make response fast wireless environment.
The technical scheme that realizes the object of the invention is such: a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
Calculate the difference of last frame error rate of specific user and target frame error rate, adjust the step-length parameter as first; The difference value of the difference of last frame error rate of specific user and target frame error rate is adjusted the step-length parameter as second; Utilizing the first adjustment step-length parameter and second to adjust the step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user adjusts.
Described calculating specific user's frame error rate further may further comprise the steps: set a frame error rate measurement period N1; With the m frame data is one section, and the data length in the statistics cycle N1 is divided into the L section; Frame in the L section is used weighted factor f1 respectively, f2 ..., fL is weighted processing, and the Frame in same section uses same weighted factor; Frame error rate in the frame error rate measurement period N1 is added up, obtain this specific user's frame error rate, N1, m, L are natural number, f1, and f2 ..., fL is a positive number.
Described frame error rate in the frame error rate measurement period N1 being added up, is whenever to receive frame data just to make the frame error rate statistics in the frame error rate measurement period N1 one time.
The weights of described weighted factor are dynamically adjusted with mobile communication environment, and what adjusted is gap between maximum weights and minimum weights.
Describedly being weighted processing with weighted factor, is to get little weights in the time of the current receiving data frames of being added up of Frame distance when far away, gets big weights when near in the time of the current receiving data frames of being added up of Frame distance.
The described first adjustment step-length parameter and the second adjustment step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user utilized is adjusted, being comprised: getting the previous information bit energy of this specific user/disturbance spectrum density (Eb/Io) is basic value; Adjust the step-length parameter with first and be multiplied by first positive parameter; Adjust the step-length parameter with second and be multiplied by second positive parameter; Carry out addition with above-mentioned three, itself and value are as the current information bit energy of this specific user/disturbance spectrum density (Eb/Io).
The described first positive parameter and the second positive parameter are obtained by system emulation.
Described second adjusts the difference that the step-length parameter can be expressed as the last frame error rate of specific user and its preceding again frame error rate.
Described frame error rate statistics is by the frame selector Frame quality that backward channel receives to be added up; The control of described exterior ring power is that the base station controller (BSC) by system carries out according to the frame error rate that counts.
The described first adjustment step-length parameter and the second adjustment step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user utilized is adjusted, and is further comprising the steps of:
Whenever receive specific user's frame data, calculate one time frame error rate; Calculate the difference of this frame error rate and target frame error rate, adduction is temporary mutually in first accumulator is recorded as first and adjusts the step-length parameter with this difference and the preceding difference of once calculating; Calculate the difference value of the difference of this frame error rate and target frame error rate, adduction is temporary mutually in second accumulator is recorded as second and adjusts the step-length parameter with this difference value and the preceding difference value that once calculates; Repeat above-mentioned steps N2 time altogether, first temporary in first accumulator adjustment step-length parameter is adjusted the step-length parameter as described first, second temporary in second accumulator adjustment step-length parameter is adjusted the step-length parameter as described second, and current to this specific user again information bit energy/disturbance spectrum density (Eb/Io) is adjusted.
Describedly adjust step-length parameter and second to first and adjust the step-length parameter and carry out adding up for N2 time, comprise that it is zero that an initial value is set, count maximum is the counter of N2; Whenever carry out adjusting step-length parameter and second one time first and adjust adding up of step-length parameter, just simultaneously counter is added 1, until the counter meter step that end repeats during to N2 with counter zero setting, N2 is a natural number.
The technical scheme that realizes the object of the invention can also be such: a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
A. calculate the frame error rate of each frame data of the specific user who is received in the frame error rate measurement period N1 that sets, the frame error rate of n frame data is designated as FER (n);
B. with the frame error rate FER and the target frame error rate FER that calculate
TargetDifference adjust the step-length parameter as first of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the first adjustment step-length parameter is designated as F (n)=FER (n)-FER
Target
C. with the frame error rate FER and the target frame error rate FER that calculate
TargetThe difference value of difference adjust the step-length parameter as second of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the second adjustment step-length parameter is designated as Δ F (n)=FER (n)-FER (n-1);
D. by adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n time with the n time first adjust the step-length parameter, the n time the second adjustment step-length parameter and relation adjust adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n+1 time, be designated as Eb/Io (n+1)=Eb/Io (n)+F (n) Kp+ Δ F (n) Kd, Kp, Kd are the positive parameters that is obtained by system emulation.
In the described steps A, also being included in the frame error rate measurement period N1 of setting, is one section with the m frame data, and the data length in the statistics cycle N1 is divided into the L section; Frame in the L section is used weighted factor f1 respectively, f2 ..., fL is weighted processing, and the Frame in same section uses same weighted factor; Frame error rate in the frame error rate measurement period N1 is added up, obtain this specific user's frame error rate, N1, m, L are natural number, f1, and f2 ..., fL is a positive number.
The technical scheme that realizes the object of the invention can also be: a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
A. calculate the frame error rate of each frame data of the specific user who is received, the frame error rate of n frame data is designated as FER (n);
B. with the frame error rate FER and the target frame error rate FER that calculate
TargetDifference temporarily adjust the step-length parameter as first of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the first adjustment step-length parameter is designated as F (n)=FER (n)-FER
Target
C. with the frame error rate FER and the target frame error rate FER that calculate
TargetThe difference value of difference temporarily adjust the step-length parameter as second of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the second adjustment step-length parameter is designated as Δ F (n)=FER (n)-FER (n-1);
D. repeated execution of steps A to C carries out N2 time altogether, to N2 time first adjust step-length parameter and second and adjust the step-length parameter and add up in first accumulator and second accumulator respectively among step B, the C;
E. by adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n time with the n time first adjust the step-length parameter, the n time the second adjustment step-length parameter and relation adjust adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n+1 time, be designated as Eb/Io (n+1)=Eb/Io (n)+F (n) Kp+ Δ F (n) Kd, Kp, Kd are the positive parameters that is obtained by system emulation, and the n time the first second adjustment step-length parameter of adjusting step-length parameter and the n time is respectively the accumulation result in first accumulator and second accumulator after N2 time is added up.
Among the described step D, comprise that also it is zero that an initial value is set, maximum count value is the counter of N2, whenever repeats a steps A to step C, just in execution in step D counter is added 1 until N2, and in execution in step E with counter zero setting.
A kind of reverse outer-loop power control method in the mobile communication system of the present invention, it is a kind of adaptive outer-loop power controlling method, when frame error rate is not equal to target frame error rate, accurately adjust the desirable value of Eb/Io, promptly utilize user's the n time frame error rate and with its Eb/Io desirable value of the n time, adjust this user's the n+1 time Eb/Io desirable value (embodying the basic thought of distributed algorithm), can reduce overtravel, and can make response fast to wireless environment, and method is simple, realize (frame error rate involved in the present invention is a positive number) easily.
Reverse outer-loop power control method of the present invention, be used for the power control of reverse link being adjusted at a slow speed in exterior ring power control, know current communication quality (frame error rate) by base station controller (BSC) by the monitoring frame error rate, base station controller carries out exterior ring power control according to the frame error rate that counts, again according to algorithm provided by the invention, obtain the desirable value of Eb/Io, for inner loop power control provides reference standard, thereby make the frame error rate of reverse link close, guarantee that the user's communications quality can maintain in certain scope to target frame error rate.
Exterior ring power of the present invention control is that the length with one or several frames is the cycle, and is foundation with the frame error rate FER of the accumulative total of reflection user communication quality index, and the adjustment at a slow speed to power of reverse link control is provided.
Method synthesis of the present invention has been considered two kinds and has been adjusted step-length parameter (also can claim variable): the difference of frame error rate and target frame error rate is adjusted the step-length parameter as one of them, can improve the adjustment precision, clearly the foundation of Tiao Zhenging; Consider the effect of environment, for the power control of avoiding outer shroud takes place is in the process of dynamic adjustment always, again the difference of the difference of frame error rate and target frame error rate is adjusted the step-length parameter as another, because it has reflected the rate of change of difference, so can effectively reduce overshoot, increase the stability of system.
According to adjustment formula of the present invention, can prove that it will converge on the unique balance point, promptly on the target frame error rate if system restrains.
To the weighted of frame error rate, strengthened the real-time response ability of this algorithm in the algorithm of the present invention.
Method provided by the invention is to set up definite relation between the desirable value of Eb/Io and frame error rate, the target frame error rate, the relation of adjusting between step-length and frame error rate, target frame error rate clear in the technical field of reverse power control first, rather than regulate as the blindness in the conventional solution; To the weighted of frame error rate, strengthened the real-time response ability in the method.
Further specify technical scheme of the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 1 is the inner-loop power control and the external circule power control process schematic diagram of reverse power control in the CDMA2000 scheme.
Fig. 2 is the inner-loop power control and the external circule power control schematic diagram of reverse power control in the emulation mobile communication system model.
Fig. 3 is the outer-loop power controlling method FB(flow block) of the reverse power control of the present invention
Fig. 4 is a kind of FB(flow block) of implementation method of the outer-loop power controlling method of the reverse power control of the present invention.
Address before Fig. 1, Fig. 2 illustrate, repeat no more.
Referring to Fig. 3, a kind of outer-loop power controlling method flow process of the reverse power control of the present invention shown in the figure is by the frame selector Frame quality of backward channel to be added up, and carries out exterior ring power control by base station controller (BSC) according to the frame error rate that counts again.
Step 31 is calculated frame error rate (FER): set a frame error rate measurement period (length) N1 earlier by the backstage, the frame error rate of received data in this cycle N1 is added up again.When frame error rate is added up, being one section with the m frame divides measurement period (length) N1, as be divided into the L section, for the priority of each Frame on time of reception in reflecting every section, the present invention also is weighted processing to frame error rate, promptly uses weighted factor f1, f2, ..., fL is weighted processing to L segment data frame respectively, to obtain the frame error rate of actual reception.The weighted factor of the Frame in each section is identical, the time order and function of Chu Xianing is got different weights frame by frame, as, when the Frame of being added up is near apart from the time of current receiving data frames, get big weights, when the Frame of being added up is far away apart from the time of current receiving data frames, get little weights.These weights should be done dynamically to adjust according to the wireless environment of reality, and wireless environment is complicated more, and the gap between then maximum weights and minimum weights is just big more, and when wireless environment was fairly simple, the gap between its maximum weights and minimum weights just can be smaller.All will carry out as above weighted to each frame data that receives, the actual reception frame error rate that is obtained is used for comparing with target frame error rate.
Step 32, the frame error rate FER and the target frame error rate FE of calculating actual reception
TargetBetween difference F1, promptly first adjust step-length parameter F1, F1=FER-FE
Target, this difference F1 (first adjusts the step-length parameter) needs every frame to calculate once.
Step 33, the frame error rate FER and the target frame error rate FER of calculating actual reception
TargetBetween the difference F2 of difference F1.Step 32,33 has been taken all factors into consideration two kinds and has been adjusted step-length parameter F1, F2, and the frame error rate of actual reception and the difference F1 of target frame error rate are adjusted the step-length parameter as one of them, can improve the adjustment precision, clearly the foundation of Tiao Zhenging; And because the effect of environment, exterior ring power control may be in the process of dynamic adjustment always, therefore again with the difference F2 of the frame error rate of actual reception and the difference of target frame error rate as second adjustment step-length parameter, the rate of change that can reflect F1 because of F2, so can effectively reduce overshoot, increase the stability of system.
Step 34, the difference F2 that presses difference F1, difference F1 calculates the desirable value of Eb/Io.For a certain user of mobile station, its Eb/Io desirable value Eb/Io (n+1) of the n+1 time is based on its Eb/Io desirable value Eb/Io (n) of the n time, adjust in conjunction with the difference delta F (n) of the difference F (n) of this user's the n time difference F (n) and the n time, its formula can be expressed as again:
In Eb/Io (n+1)=Eb/Io (n)+F (n) Kp+ Δ F (n) Kd formula, F (n) is the frame error rate FER (n) and target frame error rate FER of the n time actual reception of this user
TargetBetween difference, be expressed as: F (n)=FER (n)-FER
TargetΔ F (n) is the frame error rate FER (n) and target frame error rate FER of the n time actual reception of this user
TargetBetween the difference value of difference, be expressed as:
ΔF(n)＝F(n)-F(n-1)
＝FER(n)-FER
Target-FER(n-1)+FER
Target
=FER (n)-FER (n-1) is the difference of frame error rate FER (n) with the frame error rate FER (n-1) of the n-1 time actual reception of this user of the n time actual reception of this user; As FER (n)＜FER
Target, F (n)＜0, Eb/Io (n+1)＜Eb/Io (n) then, Kp＞0; As FER (n)＞FER
Target, F (n)＞0, Eb/Io (n+1)＞Eb/Io (n) then, Kp＞0; As FER (n)＜FER
Target, F (n)＜0, Δ F (n)＜0, Eb/Io (n+1)＜Eb/Io (n) then, Kd＞0; As FER (n)＞FER
Target, F (n)＞0, Δ F (n)＞0, Eb/Io (n+1)＞Eb/Io (n) then, Kd＞0; So Kp, Kd are positive parameter, its value can be obtained by emulation.
The algorithm of step 34 of the present invention is at the desirable value (or claiming set point or threshold value) of Eb/Io and the frame error rate FER of actual reception, target frame error rate FER
TargetBetween set up clear and definite relational expression, make two kinds of relations of adjusting between step-length parameters and the frame error rate obviously change, specialize.
Step 35 finishes.
Process by the continuous iteration of step 31 to 34 just can converge to each specific user's frame error rate (FER*), i.e. target frame error rate FER on the unique balance point gradually
TargetOn.
According to the adjustment type of step 34, can restrain after can proof system adopting method of the present invention, and converge to FER* on this balance point.
Proof is divided three parts:
If FER (n)=FER
Target, F (n)=0, Δ F (n)=0, (Eb/Io) (n+1)=(Eb/Io) (n) so, system stability, so FER*=FER
TargetIt is a balance point of system;
If FER (n) ≠ FER
Target, F (n) ≠ 0, Δ F (n) ≠ 0, (Eb/Io) (n+1) ≠ (Eb/Io) (n) so, system does not have balance point, so FER*=FER
TargetIt is a unique balance point of system;
System has only a balance point, if algorithmic statement, { FER (n+1) }
1Necessarily converge to FER
Target
The present invention not only comprises the difference signal between frame error rate and target frame error rate to the adjustment step-length parameter of Eb/Io desirable value (set point or threshold value), but also comprises the rate of change signal of this difference signal.Because if only consider difference F (n) Kp, system no doubt can eliminate the effect of error according to the characteristic performance of error, and the underaction and timely but this effect seems is because at FER (n)＞FER
TargetThe time, F (n) Kp is always positive, i.e. the effect that always (Eb/Io) (n+1) is increased.So at FER (n)=FER
TargetThe time, constantly promptly,, but continue to increase though F (n) Kp=0 can not stop immediately the n+1 time adjustment to Eb/Io at n, thus formation overshoot or vibration.The present invention is by being provided with rate of change Δ F (n) Kd of difference signal again, adjustment to (n+1) inferior Eb/Io can be shifted to an earlier date from the time, as n at a time, the increment of Eb/Io is zero, in the time period from n to n+1, increment just can suppress (Eb/Io) increase (n+1) for negative, therefore there has been the effect of Δ F (n) Kd can reduce overshoot, increased the stability of system.Therefore by comprehensive adjustment Kp, Kd can obtain more satisfactory systematic function.
In the above-mentioned outer-loop power controlling method, every reception one frame data just calculate frame error rate one time, with the difference of the difference of frame error rate and target frame error rate and this difference as adjusting the step-length parameter, 34 algorithm is adjusted the desirable value (also can be called set point or threshold value) of Eb/Io set by step again, be the scheme that a kind of every reception one frame data are just adjusted an Eb/Io desirable value, make arbitrary specific user's frame error rate very fast near target frame error rate.
Referring to Fig. 4, be another embodiment flow process of the inventive method, its step 40,41 with step 31 shown in the accompanying drawing 3,32 identical, whenever receive frame error rate (FER) and target frame error rate FER that frame data calculate a frame error rate (FER) and calculate actual reception
TargetBetween difference F1.
In exterior ring power control, whenever receive a specific user frame data, just once adjust the step-length parameter, but immediately the desirable value of Eb/Io is not adjusted by aforementioned algorithm statistics, just counter is added 1.The process that statistics is once adjusted the step-length parameter is to carry out following steps continuously: the frame error rate FER (step 40) that calculates certain specific user; Calculate the difference F1:F1=FER-FER of this frame error rate and target frame error rate
Target(step 41); With first accumulator this difference F1 that adds up, F=F+F1 (step 42); Calculate the difference F2 (step 43) of the difference F that first accumulator adds up; With second accumulator difference F2 (step 43) of this difference F: the FF=FF+F2 (step 44) that adds up; Counter is added 1 (step 45).
When receiving this specific user's frame data again, repeated execution of steps 40 to 45 is adjusted the step-length parameter and is added up, and counter adds 1, stops above-mentioned steps until the counter meter during to N2, and execution in step 47 to 49.
Promptly when counter meter during to N2, the adjustment step-length that just will add up again by algorithm of the present invention, calculates the desirable value of Eb/Io as total adjustment step-length parameter, adjusts Eb/Io, that is to say that every reception N2 frame data adjust the scheme of an Eb/Io desirable value.
Data receiving a certain specific user when frame error rate is not equal to target frame error rate, adopt method of the present invention, can adjust the desirable value of Eb/Io accurately, reduce overtravel, and can make response fast to wireless environment.And method is simple, realizes easily.
The inventive method is used through experiment on system simulation model shown in Figure 2, has obtained the invention effect of expection.Carry out the adjustment of Eb/Io by algorithm of the present invention, and as the foundation of inner loop power control.Adjusted Eb/Io compares with a standard of comparison, obtains the TPC order, and transmitting station is adjusted transmitting power according to this TPC order.Described standard of comparison is determined by the exterior ring power control algolithm.
If method of the present invention is applied in the CDMA2000 system, utilize its existing software and hardware, be not difficult to realize.
Claims (15)
1. a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
Calculate the difference of last frame error rate of specific user and target frame error rate, adjust the step-length parameter as first; The difference value of the difference of last frame error rate of specific user and target frame error rate is adjusted the step-length parameter as second; Utilizing the first adjustment step-length parameter and second to adjust the step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user adjusts.
2. a kind of reverse outer-loop power control method in the mobile communication system according to claim 1 is characterized in that: described calculating specific user's frame error rate further may further comprise the steps: set a frame error rate measurement period N1; With the m frame data is one section, and the data length in the statistics cycle N1 is divided into the L section; Frame in the L section is used weighted factor f1 respectively, f2 ..., fL is weighted processing, and the Frame in same section uses same weighted factor; Frame error rate in the frame error rate measurement period N1 is added up, obtain this specific user's frame error rate, N1, m, L are natural number, f1, and f2 ..., fL is a positive number.
3. a kind of reverse outer-loop power control method in the mobile communication system according to claim 2, it is characterized in that: described frame error rate in the frame error rate measurement period N1 being added up, is whenever to receive frame data just to make the frame error rate statistics in the frame error rate measurement period N1 one time.
4. a kind of reverse outer-loop power control method in the mobile communication system according to claim 2 is characterized in that: the weights of described weighted factor are dynamically adjusted with mobile communication environment, and what adjusted is gap between maximum weights and minimum weights.
5. a kind of reverse outer-loop power control method in the mobile communication system according to claim 2, it is characterized in that: describedly be weighted processing with weighted factor, be when the Frame of being added up is far away apart from the time of current receiving data frames, to get little weights, when the Frame of being added up is near apart from the time of current receiving data frames, get big weights.
6. a kind of reverse outer-loop power control method in the mobile communication system according to claim 1, it is characterized in that: the described first adjustment step-length parameter and the second adjustment step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user utilized is adjusted, being comprised: getting the previous information bit energy of this specific user/disturbance spectrum density (Eb/Io) is basic value; Adjust the step-length parameter with first and be multiplied by first positive parameter; Adjust the step-length parameter with second and be multiplied by second positive parameter; Carry out addition with above-mentioned three, itself and value are as the current information bit energy of this specific user/disturbance spectrum density (Eb/Io).
7. a kind of reverse outer-loop power control method in the mobile communication system according to claim 6 is characterized in that: the described first positive parameter and the second positive parameter are obtained by system emulation.
8. according to a kind of reverse outer-loop power control method in claim 1 or the 6 described mobile communication system, it is characterized in that: described second adjusts the difference that the step-length parameter can be expressed as the last frame error rate of specific user and its preceding again frame error rate.
9. a kind of reverse outer-loop power control method in the mobile communication system according to claim 1 is characterized in that: described frame error rate statistics is by the frame selector Frame quality that backward channel receives to be added up; The control of described exterior ring power is that the base station controller (BSC) by system carries out according to the frame error rate that counts.
10. a kind of reverse outer-loop power control method in the mobile communication system according to claim 1, it is characterized in that: the described first adjustment step-length parameter and the second adjustment step-length parameter information bit energy/disturbance spectrum density (Eb/Io) current to this specific user utilized is adjusted, and is further comprising the steps of:
Whenever receive specific user's frame data, calculate one time frame error rate; Calculate the difference of this frame error rate and target frame error rate, adduction is temporary mutually in first accumulator is recorded as first and adjusts the step-length parameter with this difference and the preceding difference of once calculating; Calculate the difference value of the difference of this frame error rate and target frame error rate, adduction is temporary mutually in second accumulator is recorded as second and adjusts the step-length parameter with this difference value and the preceding difference value that once calculates; Repeat above-mentioned steps N2 time altogether, first temporary in first accumulator adjustment step-length parameter is adjusted the step-length parameter as described first, second temporary in second accumulator adjustment step-length parameter is adjusted the step-length parameter as described second, and current to this specific user again information bit energy/disturbance spectrum density (Eb/Io) is adjusted.
11. a kind of reverse outer-loop power control method in the mobile communication system according to claim 10, it is characterized in that: describedly adjust step-length parameter and second to first and adjust the step-length parameter and carry out adding up for N2 time, comprise that it is zero that an initial value is set, count maximum is the counter of N2, whenever carry out one time first and adjust adding up of the step-length parameter and the second adjustment step-length parameter, just simultaneously counter is added 1, finish the step that repeats during to N2 and with counter zero setting, N2 is a natural number until the counter meter.
12. a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
A. calculate the frame error rate of each frame data of the specific user who is received in the frame error rate measurement period N1 that sets, the frame error rate of n frame data is designated as FER (n);
B. with the frame error rate FER and the target frame error rate FER that calculate
TargetDifference adjust the step-length parameter as first of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the first adjustment step-length parameter is designated as F (n)=FER (n)-FER
Target
C. with the frame error rate FER and the target frame error rate FER that calculate
TargetThe difference value of difference adjust the step-length parameter as second of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the second adjustment step-length parameter is designated as Δ F (n)=FER (n)-FER (n-1);
D. by adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n time with the n time first adjust the step-length parameter, the n time the second adjustment step-length parameter and relation adjust adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n+1 time, be designated as Eb/Io (n+1)=Eb/Io (n)+F (n) Kp+ Δ F (n) Kd, Kp, Kd are the positive parameters that is obtained by system emulation.
13. a kind of reverse outer-loop power control method according to claim 12, it is characterized in that: in the described steps A, also being included in the frame error rate measurement period N1 of setting, is one section with the m frame data, and the data length in the statistics cycle N1 is divided into the L section; Frame in the L section is used weighted factor f1 respectively, f2 ..., fL is weighted processing, and the Frame in same section uses same weighted factor; Frame error rate in the frame error rate measurement period N1 is added up, obtain this specific user's frame error rate, N1, m, L are natural number, f1, and f2 ..., fL is a positive number.
14. a kind of reverse outer-loop power control method in the mobile communication system is characterized in that may further comprise the steps:
A. calculate the frame error rate of each frame data of the specific user who is received, the frame error rate of n frame data is designated as FER (n);
B. with the frame error rate FER and the target frame error rate FER that calculate
TargetDifference temporarily adjust the step-length parameter as first of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the first adjustment step-length parameter is designated as F (n)=FER (n)-FER
Target
C. with the frame error rate FER and the target frame error rate FER that calculate
TargetThe difference value of difference temporarily adjust the step-length parameter as second of adjustment information bit energy/disturbance spectrum density (Eb/Io), the n time the second adjustment step-length parameter is designated as Δ F (n)=FER (n)-FER (n-1);
D. repeated execution of steps A to C carries out N2 time altogether, to N2 time first adjust step-length parameter and second and adjust the step-length parameter and add up in first accumulator and second accumulator respectively among step B, the C;
E. by adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n time with the n time first adjust the step-length parameter, the n time the second adjustment step-length parameter and relation adjust adjustment information bit energy/disturbance spectrum density (Eb/Io) of the n+1 time, be designated as Eb/Io (n+1)=Eb/Io (n)+F (n) Kp+ Δ F (n) Kd, Kp, Kd are the positive parameters that is obtained by system emulation, and the n time the first second adjustment step-length parameter of adjusting step-length parameter and the n time is respectively the accumulation result in first accumulator and second accumulator after N2 time is added up.
15. a kind of reverse outer-loop power control method in the mobile communication system according to claim 14, it is characterized in that: among the described step D, comprise that also it is zero that an initial value is set, maximum count value is the counter of N2, whenever repeat a steps A to step C, just in execution in step D, counter is added 1 until N2, and in execution in step E with counter zero setting.
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| CNB001282123A CN1149768C (en) | 2000-12-12 | 2000-12-12 | Reverse outer-loop power controlling method for mobile communication system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1305229C (en) * | 2004-03-12 | 2007-03-14 | 中兴通讯股份有限公司 | Reverse external ring power control method |
| CN1326332C (en) * | 2003-12-11 | 2007-07-11 | 上海贝尔阿尔卡特股份有限公司 | Implementation method for controlling power in external ring |
| CN100375404C (en) * | 2005-04-20 | 2008-03-12 | 北京首信股份有限公司 | Reversed outer ring power control method in CDMA mobile communication system |
| CN1841958B (en) * | 2005-03-28 | 2010-04-28 | 华为技术有限公司 | Method and apparatus for realizing uplink outer-loop power control in mobile communication system |
| CN1964207B (en) * | 2005-11-09 | 2010-05-05 | 中兴通讯股份有限公司 | A control method for inverse share power of CDMA mode cluster system |
| WO2011063662A1 (en) * | 2009-11-24 | 2011-06-03 | 中兴通讯股份有限公司 | Method and system for processing conversation optimization |
| CN101309491B (en) * | 2007-05-18 | 2011-09-14 | 大唐移动通信设备有限公司 | Method and device for decoding data |
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| CN1326332C (en) * | 2003-12-11 | 2007-07-11 | 上海贝尔阿尔卡特股份有限公司 | Implementation method for controlling power in external ring |
| CN1305229C (en) * | 2004-03-12 | 2007-03-14 | 中兴通讯股份有限公司 | Reverse external ring power control method |
| CN1841958B (en) * | 2005-03-28 | 2010-04-28 | 华为技术有限公司 | Method and apparatus for realizing uplink outer-loop power control in mobile communication system |
| CN100375404C (en) * | 2005-04-20 | 2008-03-12 | 北京首信股份有限公司 | Reversed outer ring power control method in CDMA mobile communication system |
| CN1964207B (en) * | 2005-11-09 | 2010-05-05 | 中兴通讯股份有限公司 | A control method for inverse share power of CDMA mode cluster system |
| CN101309491B (en) * | 2007-05-18 | 2011-09-14 | 大唐移动通信设备有限公司 | Method and device for decoding data |
| WO2011063662A1 (en) * | 2009-11-24 | 2011-06-03 | 中兴通讯股份有限公司 | Method and system for processing conversation optimization |
| CN113825221A (en) * | 2021-08-19 | 2021-12-21 | 西安闻泰信息技术有限公司 | Power control method and device |
| CN113825221B (en) * | 2021-08-19 | 2023-11-17 | 昆明闻讯实业有限公司 | Power control method and device |
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